please help

Grace
I'm 31 weeks from what I estimated and just found out I'm pregnant and I'm 17 the babies father and I haven't been tothere in about 6 months so that's what I'm going off of and idk what to do I just got the depo shot last week and don't know how to my grandparent which is who I live with and from what I looked up I'm having some serious Braxton hicks and I didn't know about being pregnant cause I have weird periods I can got mothers with out them and I had two in the past six months please help cause I got the shot cause my grandma asked me if I was pregnant cause my aunt asked her I said no then got to thinking about it and went and bought like 5 test and now know I am helppppppppppp I need advice what the hell do I do I don't want this baby with a low life I'm not with anymore for reason of he was abusive and stuff I don't know what to do how to go about it and all I was kicked out of my dad at 15 for not true reason and my grandparent took me in this coming month makes two years living with them and they have been good to me and I'm only a junior in high school I can't do this to them my grandma had my mom at 17 my mom had me at 17 and now me I'm freaking out and deal with anxiety and depression which I've been hospitalized for about 3 years ago and now it's getting bad again cause I'm scared